diff --git a/llvm/lib/Analysis/ScalarEvolution.cpp b/llvm/lib/Analysis/ScalarEvolution.cpp
--- a/llvm/lib/Analysis/ScalarEvolution.cpp
+++ b/llvm/lib/Analysis/ScalarEvolution.cpp
@@ -148,6 +148,7 @@
 
 static cl::opt<unsigned>
 MaxBruteForceIterations("scalar-evolution-max-iterations", cl::ReallyHidden,
+                        cl::ZeroOrMore,
                         cl::desc("Maximum number of iterations SCEV will "
                                  "symbolically execute a constant "
                                  "derived loop"),
diff --git a/llvm/test/Analysis/ScalarEvolution/multiple-max-iterations.ll b/llvm/test/Analysis/ScalarEvolution/multiple-max-iterations.ll
new file mode 100644
--- /dev/null
+++ b/llvm/test/Analysis/ScalarEvolution/multiple-max-iterations.ll
@@ -0,0 +1,2 @@
+; Ensure we can pass -scalar-evolution-max-iterations multiple times
+; RUN: opt -S -scalar-evolution -scalar-evolution-max-iterations=42 -scalar-evolution-max-iterations=42 < %s